British Midland Airways Limited (trading at various times throughout its history as British Midland, BMI British Midland, BMI or British Midland International) was an airline with its head office in Donington Hall in Castle Donington, close to East Midlands Airport, in the United Kingdom. The airline flew to destinations in Europe, the Middle East, Africa and Central Asia from its operational base at London Heathrow Airport, where at its peak it held ca. 13% of all takeoff and landing slots and operated over 2,000 flights a week. BMI was a member of Star Alliance from 1 July 2000 until 20 April 2012. BMI Regional was sold to Sector Aviation Holdings in May 2012 and continues to operate, whereas Bmibaby closed down in September 2012. British Midland Airways Limited held a Civil Aviation Authority (CAA) Type A Operating Licence, permitting it to carry passengers, cargo and mail on aircraft with 20 or more seats.